Specifications Material quality: Laser Grade without boundaries and visible inclusions Range of Sizes Width : 1 - 101.6 +0/-0,10 mm Thickness : 1 - 12 /-0.10 mm Length : 3 - 111 0/-0.10 mm Parallelism Plano : <3 arc minutes Clear Aperture (polished) 90% of length and width Surface Figure (power-irregularity) at 0.63 microns Width: 1 fringe - 0.5 fringe per inch Length : 1 fringe - 0.5 fringe per inch Surface Quality: Scratch-Dig: 80/50, 60/40, 40/20 : per MIL-0-13830 Brewster Angle at 10.6 microns: ZnSe 67.4°